Implement WebBluetooth getDescriptor[s]

third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom

Index: third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
diff --git a/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom b/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
index 3b2fa0a69bf2a3479449a6317d4ff12156d5f90a..0c8036caea29677ee3a03ec53531239860ca8611 100644
--- a/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
+++ b/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
@@ -20,6 +20,7 @@ enum WebBluetoothResult {
   // InvalidStateError:
   SERVICE_NO_LONGER_EXISTS,
   CHARACTERISTIC_NO_LONGER_EXISTS,
+  DESCRIPTOR_NO_LONGER_EXISTS,
   // NetworkError:
   CONNECT_ALREADY_IN_PROGRESS,
   CONNECT_ATTRIBUTE_LENGTH_INVALID,
@@ -51,6 +52,8 @@ enum WebBluetoothResult {
   NO_SERVICES_FOUND,
   CHARACTERISTIC_NOT_FOUND,
   NO_CHARACTERISTICS_FOUND,
+  DESCRIPTOR_NOT_FOUND,
+  NO_DESCRIPTORS_FOUND,
   WEB_BLUETOOTH_NOT_SUPPORTED,
   BLUETOOTH_LOW_ENERGY_NOT_AVAILABLE,
   // NotSupportedError:
@@ -61,6 +64,7 @@ enum WebBluetoothResult {
   GATT_UNTRANSLATED_ERROR_CODE,
   // SecurityError:
   GATT_NOT_AUTHORIZED,
+  BLACKLISTED_DESCRIPTOR_UUID,
   BLACKLISTED_CHARACTERISTIC_UUID,
   BLACKLISTED_READ,
   BLACKLISTED_WRITE,
@@ -109,6 +113,11 @@ struct WebBluetoothRemoteGATTCharacteristic {
   uint32 properties;
 };
 
+struct WebBluetoothRemoteGATTDescriptor {
+  string instance_id;
+  string uuid;
+};
+
 // Web Bluetooth Interface that Blink can use to perform
 // Bluetooth GATT Operations on Bluetooth Devices.
 interface WebBluetoothService {
@@ -178,6 +187,34 @@ interface WebBluetoothService {
   // |characteristic_instance_id|.
   RemoteCharacteristicStopNotifications(
     string characteristic_instance_id) => ();
+
+  // Returns the Descriptors of a GATT Characteristics with |service_instance_id|.
+  // If |quantity| == WebBluetoothGATTQueryQuantity::SINGLE, only one
+  // descriptor will be returned.
+  RemoteCharacteristicGetDescriptors(
+    string characteristics_instance_id,
+    WebBluetoothGATTQueryQuantity quantity,
+    bluetooth.mojom.UUID? characteristics_uuid) => (
+      WebBluetoothResult result,
+      array<WebBluetoothRemoteGATTDescriptor>? descriptors);
+
+  // Reads the value for descriptor with
+  // |descriptor_instance_id|. If the value is successfully read the
+  // callback will be run with WebBluetoothResult::SUCCESS and the
+  // descriptor's value. If the value is not successfully read the
+  // callback with be run with the corresponding error and nullptr for value.
+  RemoteDescriptorReadValue(
+    string descriptor_instance_id) => (
+    WebBluetoothResult result,
+    array<uint8>? value);
+
+  // Writes a value to the descriptor with
+  // |descriptor_instance_id|. The callback is run with
+  // WebBluetoothResult::SUCCESS if the value was successfully
+  // written.
+  RemoteDescriptorWriteValue(
+    string descriptor_instance_id,
+    array<uint8> value) => (WebBluetoothResult result);
 };
 
 // Classes should implement this interface and pass an associated pointer